Hermann krum



UNITED STATES PATENT OFFICE.

HERMANN KRUM, OF GOEPPINGEN, GERMANY.

PRQCESSOF MAKING ARTIFICIAL LEATHER.

SPECIFICATION forming part of Letters Patent No. 525,985, datedSeptember 11, 1894.

Application filed April 13, 1893. Serial No. 470,219. (No specimens.)

To all whom it may concern.-

the said process, paper of any suitable raw material and of any desiredthickness is so impregnated during its treatment on the paper machineand while still in a pulpy or unfinished condition that the sameacquires a soft, leathery and pliable quality and also the elasticity,necessary for the subsequent embossing to produce the grain in imitationof leather. As an impregnating substance I employ easily solubleunctuous substances, such as glycerine and the like, or non-drying oilssoluble in alcohol, such as castor oil, oil of rhodium, oil of.horsechestnut, &c.

In carrying out my invention the paper in the paper machine, and whilestill in an unfinished or a pulpy condition, preferably before passingthe last Wet-press, is carried through a receptacle filled with anunctuous substance, such as glycerine, or a mixture of glycerine, or ofan easily soluble oil with water, or with a mixture of such substances.I may also employ mixtures of nondrying oils soluble in alcohol; but asa rule the first named mixtures are preferable in View of theircomparative cheapness. Instead of carrying the paper through areceptacle filled with glycerine or the like, the same may beimpregnated by sprinkling or spraying the same with the aforesaidsubstances, or by any other suitable means. I have also found that themost suitable substance or bath for impregnating the paper is themixture of about 7 Baum of glycerine with water. The liquor orInenstruum which has been expressed from the paper in its passagethrough the wetpress is again collected in a receiver and used fordiluting the impregnating loath. I thus obviate any waste of thesubstance employed. The paper thus prepared may now be used without anyfurther treatment, or it may be directly embossed, or it may first becoated with a suitable color or pigment and then embossed.

What I claim, and desire to secure by Letters Patent, is

1. The process of preparing imitation leather or the like, whichconsists in impregnating the paper, while in an unfinished or a pulpycondition, with an unctuous substance, substantially as set forth.

2. The process of preparing imitation leather or the like, whichconsists in passing the unfinished paper, before it leaves the papermachine, through a receptacle containing a bath of an unctuoussubstance, substantially as set forth.

3. The process of preparing imitation leather or the like, whichconsists intreating the paper, while in an unfinished or a pulpycondition, with an unctuous substance, then completing the paper, andfinally embossing the same with a suitable grain, substantially as setforth.

l. The process of making artificial leather, which consists inimpregnating paper, in an unfinished condition, after being formed, andbefore it has passed the last wet-press, with glycerine, substantiallyas set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

- I-IERMANN KRUM.

Witnesses:

AUGUST B. DANTZ, FERDINAND HOFMANN.

